111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/* base16.h
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Hex encoding and decoding, following spki conventions (i.e.
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allowing whitespace between digits).
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Copyright (C) 2002 Niels Möller
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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#ifndef NETTLE_BASE16_H_INCLUDED
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#define NETTLE_BASE16_H_INCLUDED
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#include "nettle-types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Name mangling */
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#define base16_encode_single nettle_base16_encode_single
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#define base16_encode_update nettle_base16_encode_update
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#define base16_decode_init nettle_base16_decode_init
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#define base16_decode_single nettle_base16_decode_single
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#define base16_decode_update nettle_base16_decode_update
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#define base16_decode_final nettle_base16_decode_final
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/* Base16 encoding */
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/* Maximum length of output for base16_encode_update. */
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#define BASE16_ENCODE_LENGTH(length) ((length) * 2)
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/* Encodes a single byte. Always stores two digits in dst[0] and dst[1]. */
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void
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base16_encode_single(char *dst,
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uint8_t src);
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/* Always stores BASE16_ENCODE_LENGTH(length) digits in dst. */
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void
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base16_encode_update(char *dst,
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size_t length,
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const uint8_t *src);
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/* Base16 decoding */
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/* Maximum length of output for base16_decode_update. */
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/* We have at most 4 buffered bits, and a total of (length + 1) * 4 bits. */
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#define BASE16_DECODE_LENGTH(length) (((length) + 1) / 2)
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struct base16_decode_ctx
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{
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unsigned char word; /* Leftover bits */
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unsigned char bits; /* Number buffered bits */
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};
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void
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base16_decode_init(struct base16_decode_ctx *ctx);
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/* Decodes a single byte. Returns amount of output (0 or 1), or -1 on
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* errors. */
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int
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base16_decode_single(struct base16_decode_ctx *ctx,
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uint8_t *dst,
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char src);
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/* Returns 1 on success, 0 on error. DST should point to an area of
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* size at least BASE16_DECODE_LENGTH(length). The amount of data
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* generated is returned in *DST_LENGTH. */
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int
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base16_decode_update(struct base16_decode_ctx *ctx,
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size_t *dst_length,
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uint8_t *dst,
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size_t src_length,
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const char *src);
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/* Returns 1 on success. */
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int
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base16_decode_final(struct base16_decode_ctx *ctx);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NETTLE_BASE16_H_INCLUDED */
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